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    <title>Document</title>
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    <script>
      /*
        pow(2, 3)  return 2 * pow(2, 2)=4;
        pow(2, 2)  return 2 * pow(2, 1)=2;
        pow(2, 1)  2
      */
      function pow(x, n) {
        if (n === 1) return x;
        return x * pow(x, n - 1);
      }
      console.log(pow(2, 3)); //1
    </script>
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